单片机系统“PC”失控的软件措施Software Measure of GettingO uto fC ontrolfo r“PC"in S ingleC hipC omputerS ystem谧 加 春 王 晓 基 雷 小 华(江 西 理 工 大 学机 电 工 程 学 院 ，赣 州 34 10 00)摘要单片机系统在实际工业现场中可能遇到各种干扰和自身的随机性故障。现场恶劣的环境有可能使计算机系统发生异常，计算机程序指针“PC”失控就是常见的故障之一，如果发生“PC”失控，将导致CPI工作混乱，酿成严重的事故。研究了“PC”失控的原因，并指出软件抗干扰的几种方法，有效保证单片机系统的正常工作。关键词单片机“PC”失控抗干扰Abstract Inp racticalin dustrialfi elds,th ereis v ariousin terferencea fectingo perationo fsi nglec hipc omputersy stemsa ndt hec omputersy stems。fac吨random faults饰themselves. It is very common that the severe environment makes the computer systems abnOrmal. The program counter "PC"gettingo utof co ntOrlis on eo fth ec ommonfa ults.If th isoc curs,C PUw ouldb eru nningo utof Or deran din tOrducesse riousan cient.T hec ausesof " PC"geting out of control， studied in this paper and some countermeasures of anti-interference师software are given to ensure single chip computer systemwOrking properly.KeywOrds Single。饰computer POrgramc ounter"P C" Anti-interfeernc 在设 计 和 开发单片机系统时，一般难以周全地预计单片机系统在实际工业现场中可能遇到的各种干扰和自身的随机性故障。因此，除了采取防止和抑制干扰的各项措施外，还应该借助于软件措施克服某些干扰，系统还应具备迅速自行恢复的能力。本文介绍的应对单片机系统PC失控的软件措施，设计灵活，节省硬件资源，能保证测控系统长期可靠地运行。MC S- 5 1单片机以其优良的性能价格比大量应用于工业现场测试和控制领域。但是，现场恶劣的环境有可能使计算机系统发生异常，计算机程序指针PC失控就是常见的故障之一，一旦发生PC“走飞”，计算机系统就会出现工作混乱，酿成严重的事故。为 了 在 CP 失控时尽量减少由此带来的不利影响，并尽快使系统恢复正常，需要采取一定的软件措施和硬件措施。常见的硬件措施有“看门狗”电路。软件措施设置的前提条件是:①在干扰作用下，微机系统硬件部分不会受到任何损坏，或者损坏部分设置有监测状态可供查询;②程序区不会受到干扰侵害。单片机系统的程序和表格以及重要的参数均设置在ROM区，不会因干扰的侵人而改变;③ RAM区中的重要数据不会被破坏，或者虽然被破坏，但是可以重新建立。
上传时间： 2013-11-02
上传用户：bhqrd30
基于ADSP-BF561的数字摄像系统设计Design of Digital Video Camera System Based on Digital Signal ProcessOrADSP-BF561（浙江大学 信息与通信工程研究所，浙江 杭州 310027） 马海杰, 刘云海摘要：介绍了基于ADI双核的数字信号处理芯片ADSP-BF561 的数字摄像系统实现方案。系统包括硬件和软件两部分，硬件主要有ADSP-BF561及其外围电路、音视频模数/数模转换、CF卡/微硬盘接口等部分。软件主要有操作系统及音视频编解码算法等部分。关键词：ADSP-BF561 ;数字摄像机;微硬盘;MPEG-4;A/D;D/A中图分类号:TN948.41文献标识码:AAbstract: An implementation of digital video camera system based on ADI dual cOre digital signal processOr ADSP-BF561 is introduced. The system can be divided into two parts——hardware and software design. The hardware design includes ADSP-BF561 and perpheral apparatus, A/D,D/A, CF card Or Microdrive and so on. The software includes operating system , audio and video coding algOrithm.Key wOrds: ADSP-BF561; digital video camera; microdrive; MPEG-4;A/D;D/A
上传时间： 2013-11-10
上传用户：yl1140vista
The AT89C52 is a low-power, high-perfOrmance CMOS 8-bit microcomputer with 8Kbytes of Flash programmable and erasable read only memOry (PEROM). The deviceis manufactured using Atmel’s high-density nonvolatile memOry technology and iscompatible with the industry-standard 80C51 and 80C52 instruction set and pinout.The on-chip Flash allows the program memOry to be reprogrammed in-system Or by aconventional nonvolatile memOry programmer. By combining a versatile 8-bit CPUwith Flash on a monolithic chip, the Atmel AT89C52 is a powerful microcomputerwhich provides a highly-flexible and cost-effective solution to many embedded controlapplications.
上传时间： 2013-11-10
上传用户：1427796291
（POrtmon is an application that lets you monitOr serial and parallel activity on your local system, Or any computer on the netwOrk that you can reach via TCP/IP. It is the most powerful tool available fOr tracking down pOrt-related configuration problems and analyzing application pOrt usage.）
上传时间： 2013-11-07
上传用户：1412904892
设计一种应用于某全地形ATV车载武器装置中的中控系统，该系统设计是以TMS320F2812型DSP为核心，采用模块化设计思想，对其硬件部分进行系统设计，能够完成对武器装置高低、回转方向的运动控制，实现静止或行进状态中对目标物的测距，自动瞄准以及按既定发射模式发射弹丸和各项安全性能检测等功能。通过编制相应的软件，对其进行系统调试，验证了该设计运行稳定。 Abstract: A central control system applied to an ATV vehicle weapons is designed. The system design is based on TMS320F2812 DSP as the cOre， uses modular design fOr its hardware parts. The central control system can complete the motion control of the level of weapons and equipment， rotation direction， to achieve a state of static Or moving objects on the target ranging， auto-targeting and accOrding to the established target and the projectile and the launch of the security perfOrmance testing and other functions. Through the development of appropriate software and to carry out system testing to verify the stability of this design and operation.
上传时间： 2013-11-02
上传用户：jshailingzzh
Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their productsOr to discontinue any product Or service without notice, and advise customers to obtain the latestversion of relevant infOrmation to verify, befOre placing Orders, that infOrmation being relied onis current and complete. All products are sold subject to the terms and conditions of sale suppliedat the time of Order acknowledgement, including those pertaining to warranty, patentinfringement, and limitation of liability
上传时间： 2013-12-26
上传用户：凌云御清风
中文版详情浏览：http://www.elecfans.com/emb/fpga/20130715324029.html Xilinx UltraScale:The Next-Generation Architecture fOr Your Next-Generation Architecture The Xilinx® UltraScale™ architecture delivers unprecedented levels of integration and capability with ASIC-class system- level perfOrmance fOr the most demanding applications. The UltraScale architecture is the industr y's f irst application of leading-edge ASIC architectural enhancements in an All Programmable architecture that scales from 20 nm planar through 16 nm FinFET technologies and beyond, in addition to scaling from monolithic through 3D ICs. Through analytical co-optimization with the X ilinx V ivado® Design Suite, the UltraScale architecture provides massive routing capacity while intelligently resolving typical bottlenecks in ways never befOre possible. This design synergy achieves greater than 90% utilization with no perfOrmance degradation. Some of the UltraScale architecture breakthroughs include: • Strategic placement (virtually anywhere on the die) of ASIC-like system clocks, reducing clock skew by up to 50% • Latency-producing pipelining is virtually unnecessary in systems with massively parallel bus architecture, increasing system speed and capability • Potential timing-closure problems and interconnect bottlenecks are eliminated, even in systems requiring 90% Or mOre resource utilization • 3D IC integration makes it possible to build larger devices one process generation ahead of the current industr y standard • Greatly increased system perfOrmance, including multi-gigabit serial transceivers, I/O, and memOr y bandwidth is available within even smaller system power budgets • Greatly enhanced DSP and packet handling The Xilinx UltraScale architecture opens up whole new dimensions fOr designers of ultra-high-capacity solutions.
标签： UltraScale Xilinx 架构
上传时间： 2013-11-13
上传用户：瓦力瓦力hong
This white paper discusses how market trends, the need fOr increased productivity, and new legislation have accelerated the use of safety systems in industrial machinery. This TÜV-qualified FPGA design methodology is changing the paradigms of safety designs and will greatly reduce development effOrt, system complexity, and time to market. This allows FPGA users to design their own customized safety controllers and provides a significant competitive advantage over traditional microcontroller Or ASIC-based designs. Introduction The basic motivation of deploying functional safety systems is to ensure safe operation as well as safe behaviOr in cases of failure. Examples of functional safety systems include train brakes, proximity sensOrs fOr hazardous areas around machines such as fast-moving robots, and distributed control systems in process automation equipment such as those used in petrochemical plants. The International Electrotechnical Commission’s standard, IEC 61508: “Functional safety of electrical/electronic/programmable electronic safety-related systems,” is understood as the standard fOr designing safety systems fOr electrical, electronic, and programmable electronic (E/E/PE) equipment. This standard was developed in the mid-1980s and has been revised several times to cover the technical advances in various industries. In addition, derivative standards have been developed fOr specific markets and applications that prescribe the particular requirements on functional safety systems in these industry applications. Example applications include process automation (IEC 61511), machine automation (IEC 62061), transpOrtation (railway EN 50128), medical (IEC 62304), automotive (ISO 26262), power generation, distribution, and transpOrtation. 图Figure 1. Local Safety System
上传时间： 2013-11-05
上传用户：维子哥哥
Designing withProgrammable Logicin an Analog WOrldProgrammable logic devicesrevolutionized digital design over 25years ago, promising designers a blankchip to design literally any functionand program it in the field. PLDs canbe low-logic density devices that usenonvolatile sea-of-gates cells calledcomplex programmable logic devices(CPLDs) Or they can be high-densitydevices based on SRAM look-up tables
标签： Solutions Analog Xilinx FPGAs
上传时间： 2013-11-01
上传用户：a67818601
Designing withProgrammable Logicin an Analog WOrldProgrammable logic devices revolutionizeddigital design over 25 years ago,promising designers a blank chip todesign literally any function and programit in the field. PLDs can be low-logicdensity devices that use nonvolatilesea-of-gates cells called complexprogrammable logic devices (CPLDs)Or they can be high-density devicesbased on SRAM look-up tables (LUTs)
标签： Solutions Analog Altera FPGAs
上传时间： 2013-11-08
上传用户：虫虫虫虫虫虫
